Component level xBuddy repair: diode D37, "150"
On the off chance someone else does component level repairs: My xBuddy board FDM-MK4-xBuddy blew F1, which feeds power to the extruder nozzle. With F1 removed, there showed a dead short from the output end of that fuse holder to ground/common. This persisted with the output disconnected. There doesn't appear to be a schematic available online. I figured the problem would be a shorted part, most likely a diode or capacitor. Could see D37 connected apparently as a "catch" diode directly to the output terminal of F1. Pulled up one end of F1, and sure enough, it's shorted. It appears to be a Diodes Inc part, labeled simply "150". So far, I haven't found a Diodes Inc part whose data sheet claims that as a marking: I do find B150 called out for Schottky 1A, 50V SMA-size. If nobody can help with a better match, I'll just try the B150, or perhaps the 3-A rated B350 which might be a bit more robust in this application. Comments welcome, of course.
RE: Component level xBuddy repair: diode D37, "150"
You can find the X-Buddy schematic here:
https://www.prusa3d.com/downloads/Electronics_drawings/FDM-xBUDDY-44.pdf
Strangely enough, it's on the Prusa website, but who would look for it there, right?
RE: Component level xBuddy repair: diode D37, "150"
The diode in question is an ESD protection diode of the type SMAJ28A-13-F. Find the rest yourself.
RE: Component level xBuddy repair: diode D37, "150"
Thank you Miroslav! I saw several other people when I searched for the schematic also wanting one. I did try on the Prusa site, but didn't find it. It is a help.
Looking at D37 again, I see it is marked also with JG, which is the proper code for SMAJ28A-13-F. We normally have very little trouble with ESD here in rainy Seattle. I wonder what caused D37 to short. From the Diodes Inc data sheet, it seems like any ESD I'd expect to see here would simply be absorbed. Perhaps just a weak part. Or perhaps the power supply had an unwelcome transient at its output. I'll check that out.
Again, thanks for posting the schematic (and calling out the part number). It is helpful.